LG LGXBR342 Service Manual page 54

No TV, External Input video signal
No : TV signal
YES
TV 701-17
Check signal And
circuit
YES
C331
YES
IC301 - 32
YES
IC301 – 26 check
YES
Q307 collector
Signal, power 12 V
YES
Q507, Q504, Q505
Check circuit
YES
MICOM – 50, 52
Check In/Output
YES
C644, Q605, C645
Check circuit
YES
R4601
Check signal
No : AV1 signal
YES
NO
IC602 - 1
IC602 – 7
Check output
YES
IC301 - 28
NO
IC4009-8 : HIGH
/RST_VIDEO
YES
when reset IC4009
NO
– 31, 32 Check I C
2
Clk, Data
YES
check IC4004 91,
NO
94 (VI_CLK, VI_
VSYNC0)
YES
IC4009 -> IC1099
NO
Check VI_D0~VO_D7
signal
YES
<When playing DISC, no COMPONENT,
COMPOSIT/S-VIDEO signal> Check
3-64
No : AV2 signal
YES
NO
IC602 - 3
YES
IC2075 – 8,9
signal
Check R109,
R110 Signal and
3.3V level
NO
Check X401 clock
oscillated
NO
Check IC4009
power and other
circuits
No : S-JACK signal
YES
IC7711 – 1, 3, 8
check
YES
IC602 – 5 check
Replace
X401 X-TAL